1 //===----------------------------------------------------------------------===// 2 // 3 // Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions. 4 // See https://llvm.org/LICENSE.txt for license information. 5 // SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception 6 // 7 //===----------------------------------------------------------------------===// 8 9 #include <__config> 10 #include <chrono> 11 #include <filesystem> 12 #include <time.h> 13 14 #include "posix_compat.h" // TimeSpec 15 16 #if defined(_LIBCPP_WIN32API) 17 # define WIN32_LEAN_AND_MEAN 18 # define NOMINMAX 19 # include <windows.h> 20 #endif 21 22 #if !defined(CLOCK_REALTIME) && !defined(_LIBCPP_WIN32API) 23 # include <sys/time.h> // for gettimeofday and timeval 24 #endif 25 26 _LIBCPP_BEGIN_NAMESPACE_FILESYSTEM 27 28 const bool _FilesystemClock::is_steady; 29 30 _FilesystemClock::time_point _FilesystemClock::now() noexcept { 31 typedef chrono::duration<rep> __secs; 32 #if defined(_LIBCPP_WIN32API) 33 typedef chrono::duration<rep, nano> __nsecs; 34 FILETIME time; 35 GetSystemTimeAsFileTime(&time); 36 detail::TimeSpec tp = detail::filetime_to_timespec(time); 37 return time_point(__secs(tp.tv_sec) + 38 chrono::duration_cast<duration>(__nsecs(tp.tv_nsec))); 39 #elif defined(CLOCK_REALTIME) 40 typedef chrono::duration<rep, nano> __nsecs; 41 struct timespec tp; 42 if (0 != clock_gettime(CLOCK_REALTIME, &tp)) 43 __throw_system_error(errno, "clock_gettime(CLOCK_REALTIME) failed"); 44 return time_point(__secs(tp.tv_sec) + 45 chrono::duration_cast<duration>(__nsecs(tp.tv_nsec))); 46 #else 47 typedef chrono::duration<rep, micro> __microsecs; 48 timeval tv; 49 gettimeofday(&tv, 0); 50 return time_point(__secs(tv.tv_sec) + __microsecs(tv.tv_usec)); 51 #endif // CLOCK_REALTIME 52 } 53 54 _LIBCPP_END_NAMESPACE_FILESYSTEM 55